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The angle between the lines whose direct...

The angle between the lines whose direction cosines are proportional to (1,2,1) and (2,-3,6) is

A

`cos^(-1)(1/(7sqrt(6)))`

B

`cos^(-1)(2/(7sqrt(6)))`

C

`cos^(-1)(3/(7sqrt(6)))`

D

`cos^(-1) (4/(7sqrt(6)))`

Text Solution

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The correct Answer is:
B
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